import { describe, it, expect, beforeEach, jest } from '@jest/globals';
import { captureException, captureMessage, withScope } from '@sentry/core';

// Mock Sentry core functions
jest.mock('@sentry/core', () => ({
  captureException: jest.fn(),
  captureMessage: jest.fn(),
  withScope: jest.fn((callback: any) => callback({
    setTag: jest.fn(),
    setContext: jest.fn(),
    setLevel: jest.fn(),
    setUser: jest.fn(),
    setExtra: jest.fn()
  })),
  getCurrentHub: jest.fn(() => ({
    getClient: jest.fn(() => ({
      captureException: jest.fn(),
      captureMessage: jest.fn()
    }))
  }))
}));

describe('Error Handling', () => {
  beforeEach(() => {
    jest.clearAllMocks();
  });

  describe('Exception capturing', () => {
    it('should capture JavaScript errors', () => {
      const mockCaptureException = captureException as jest.MockedFunction<typeof captureException>;
      const error = new Error('Test JavaScript error');

      captureException(error);

      expect(mockCaptureException).toHaveBeenCalledWith(error);
    });

    it('should capture promise rejections', async () => {
      const mockCaptureException = captureException as jest.MockedFunction<typeof captureException>;
      const rejectionReason = new Error('Promise rejection error');

      // Simulate unhandled promise rejection
      try {
        await Promise.reject(rejectionReason);
      } catch (error) {
        captureException(error);
      }

      expect(mockCaptureException).toHaveBeenCalledWith(rejectionReason);
    });

    it('should capture miniapp API errors', () => {
      const mockCaptureException = captureException as jest.MockedFunction<typeof captureException>;
      const apiError = {
        errMsg: 'request:fail timeout',
        errCode: -1
      };

      captureException(new Error(`Miniapp API Error: ${apiError.errMsg}`));

      expect(mockCaptureException).toHaveBeenCalledWith(
        expect.objectContaining({
          message: expect.stringContaining('request:fail timeout')
        })
      );
    });

    it('should capture network errors', () => {
      const mockCaptureException = captureException as jest.MockedFunction<typeof captureException>;
      const networkError = new Error('Network request failed');
      networkError.name = 'NetworkError';

      captureException(networkError);

      expect(mockCaptureException).toHaveBeenCalledWith(
        expect.objectContaining({
          name: 'NetworkError',
          message: 'Network request failed'
        })
      );
    });

    it('should capture custom errors with context', () => {
      const mockWithScope = withScope as jest.MockedFunction<typeof withScope>;
      const mockCaptureException = captureException as jest.MockedFunction<typeof captureException>;
      
      const customError = new Error('Custom business logic error');
      
      withScope((scope) => {
        scope.setTag('errorType', 'business');
        scope.setContext('operation', {
          name: 'userRegistration',
          step: 'validation'
        });
        captureException(customError);
      });

      expect(mockWithScope).toHaveBeenCalled();
      expect(mockCaptureException).toHaveBeenCalledWith(customError);
    });
  });

  describe('Message capturing', () => {
    it('should capture info messages', () => {
      const mockCaptureMessage = captureMessage as jest.MockedFunction<typeof captureMessage>;
      
      captureMessage('User completed onboarding', 'info');

      expect(mockCaptureMessage).toHaveBeenCalledWith('User completed onboarding', 'info');
    });

    it('should capture warning messages', () => {
      const mockCaptureMessage = captureMessage as jest.MockedFunction<typeof captureMessage>;
      
      captureMessage('API response time is slow', 'warning');

      expect(mockCaptureMessage).toHaveBeenCalledWith('API response time is slow', 'warning');
    });

    it('should capture debug messages', () => {
      const mockCaptureMessage = captureMessage as jest.MockedFunction<typeof captureMessage>;
      
      captureMessage('Debug: User interaction tracked', 'debug');

      expect(mockCaptureMessage).toHaveBeenCalledWith('Debug: User interaction tracked', 'debug');
    });

    it('should capture messages with additional context', () => {
      const mockWithScope = withScope as jest.MockedFunction<typeof withScope>;
      const mockCaptureMessage = captureMessage as jest.MockedFunction<typeof captureMessage>;
      
      withScope((scope) => {
        scope.setTag('feature', 'payment');
        scope.setExtra('transactionId', 'txn_123456');
        captureMessage('Payment processing completed', 'info');
      });

      expect(mockWithScope).toHaveBeenCalled();
      expect(mockCaptureMessage).toHaveBeenCalledWith('Payment processing completed', 'info');
    });
  });

  describe('Error boundaries', () => {
    it('should handle component lifecycle errors', () => {
      const mockCaptureException = captureException as jest.MockedFunction<typeof captureException>;
      
      // Simulate component error
      const componentError = new Error('Component render failed');
      componentError.stack = 'Error: Component render failed\n    at Component.render';
      
      // Error boundary would catch this
      try {
        throw componentError;
      } catch (error) {
        withScope((scope) => {
          scope.setTag('errorBoundary', 'component');
          scope.setContext('component', {
            name: 'UserProfile',
            props: { userId: '123' }
          });
          captureException(error);
        });
      }

      expect(mockCaptureException).toHaveBeenCalledWith(componentError);
    });

    it('should handle async operation errors', async () => {
      const mockCaptureException = captureException as jest.MockedFunction<typeof captureException>;
      
      const asyncError = new Error('Async operation failed');
      
      try {
        // Simulate async operation that fails
        await new Promise((_, reject) => {
          setTimeout(() => reject(asyncError), 10);
        });
      } catch (error) {
        withScope((scope) => {
          scope.setTag('errorType', 'async');
          scope.setContext('operation', {
            type: 'dataFetch',
            timeout: 5000
          });
          captureException(error);
        });
      }

      expect(mockCaptureException).toHaveBeenCalledWith(asyncError);
    });

    it('should handle event handler errors', () => {
      const mockCaptureException = captureException as jest.MockedFunction<typeof captureException>;
      
      const eventError = new Error('Event handler failed');
      
      // Simulate event handler error
      const mockEventHandler = () => {
        try {
          throw eventError;
        } catch (error) {
          withScope((scope) => {
            scope.setTag('errorType', 'eventHandler');
            scope.setContext('event', {
              type: 'click',
              target: 'submitButton'
            });
            captureException(error);
          });
        }
      };

      mockEventHandler();

      expect(mockCaptureException).toHaveBeenCalledWith(eventError);
    });
  });

  describe('Error recovery', () => {
    it('should implement retry logic for network errors', async () => {
      const mockCaptureMessage = captureMessage as jest.MockedFunction<typeof captureMessage>;
      let attempts = 0;
      const maxRetries = 3;

      const retryableOperation = async (): Promise<string> => {
        attempts++;
        if (attempts < 3) {
          throw new Error('Network timeout');
        }
        return 'Success';
      };

      const executeWithRetry = async (): Promise<string> => {
        for (let i = 0; i < maxRetries; i++) {
          try {
            return await retryableOperation();
          } catch (error) {
            if (i === maxRetries - 1) {
              captureException(error);
              throw error;
            }
            captureMessage(`Retry attempt ${i + 1} failed`, 'warning');
            await new Promise(resolve => setTimeout(resolve, 1000 * (i + 1)));
          }
        }
        throw new Error('Max retries exceeded');
      };

      const result = await executeWithRetry();

      expect(result).toBe('Success');
      expect(mockCaptureMessage).toHaveBeenCalledTimes(2); // Two retry warnings
    });

    it('should implement fallback mechanisms', () => {
      const mockCaptureMessage = captureMessage as jest.MockedFunction<typeof captureMessage>;
      
      const primaryOperation = () => {
        throw new Error('Primary operation failed');
      };

      const fallbackOperation = () => {
        return 'Fallback result';
      };

      const executeWithFallback = () => {
        try {
          return primaryOperation();
        } catch (error) {
          captureMessage('Primary operation failed, using fallback', 'warning');
          return fallbackOperation();
        }
      };

      const result = executeWithFallback();

      expect(result).toBe('Fallback result');
      expect(mockCaptureMessage).toHaveBeenCalledWith(
        'Primary operation failed, using fallback',
        'warning'
      );
    });

    it('should implement graceful degradation', () => {
      const mockCaptureMessage = captureMessage as jest.MockedFunction<typeof captureMessage>;
      
      const advancedFeature = () => {
        throw new Error('Advanced feature not supported');
      };

      const basicFeature = () => {
        return 'Basic functionality';
      };

      const executeWithDegradation = () => {
        try {
          return advancedFeature();
        } catch (error) {
          captureMessage('Advanced feature failed, degrading to basic', 'info');
          return basicFeature();
        }
      };

      const result = executeWithDegradation();

      expect(result).toBe('Basic functionality');
      expect(mockCaptureMessage).toHaveBeenCalledWith(
        'Advanced feature failed, degrading to basic',
        'info'
      );
    });
  });
});